globalchange  > 科学计划与规划
DOI: 10.1002/2015GL066683
论文题名:
Frequency variability of standing Alfvén waves excited by fast mode resonances in the outer magnetosphere
作者: Archer M.O.; Hartinger M.D.; Walsh B.M.; Plaschke F.; Angelopoulos V.
刊名: Geophysical Research Letters
ISSN: 0094-8358
EISSN: 1944-8089
出版年: 2015
卷: 42, 期:23
起始页码: 10150
结束页码: 10159
语种: 英语
英文关键词: magnetosphere ; outer ; resonance ; ULF ; variability
Scopus关键词: Resonance ; Solar energy ; Density distributions ; Discrete frequencies ; Frequency variability ; Magnetic field modeling ; Median absolute deviation ; Outer ; ULF ; Variability ; Magnetosphere ; frequency analysis ; magnetic field ; magnetopause ; magnetosphere ; plasma ; resonance ; solar cycle
英文摘要: Coupled fast mode resonances (cFMRs) in the outer magnetosphere, between the magnetopause and a turning point, are often invoked to explain observed discrete frequency field line resonances. We quantify their frequency variability, applying cFMR theory to a realistic magnetic field model and magnetospheric density profiles observed over almost half a solar cycle. Our calculations show that cFMRs are most likely around dawn, since the plasmaspheric plumes and extended plasmaspheres often found at noon and dusk can preclude their occurrence. The relative spread (median absolute deviation divided by the median) in eigenfrequencies is estimated to be 28%, 72%, and 55% at dawn, noon, and dusk, respectively, with the latter two chiefly due to density. Finally, at dawn we show that the observed bimodal density distribution results in bimodal cFMR frequencies, whereby the secondary peaks are consistent with the so-called "CMS" frequencies that have previously been attributed to cFMRs. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953635172&doi=10.1002%2f2015GL066683&partnerID=40&md5=8087d9b7ba5120f40397cbe4f4ccb89e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7974
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Blackett Laboratory, Imperial College London, London, United Kingdom

Recommended Citation:
Archer M.O.,Hartinger M.D.,Walsh B.M.,et al. Frequency variability of standing Alfvén waves excited by fast mode resonances in the outer magnetosphere[J]. Geophysical Research Letters,2015-01-01,42(23).
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